CVE-2026-13886: Google Chrome Auth Bypass Vulnerability

CVE-2026-13886 Overview

CVE-2026-13886 is a policy enforcement weakness in the Isolated Web Apps feature of Google Chrome. Versions prior to 150.0.7871.47 fail to properly enforce Content Security Policy (CSP) restrictions. A remote attacker can bypass CSP protections by delivering a crafted HTML page to a targeted user. The flaw is classified under [CWE-693: Protection Mechanism Failure] and requires user interaction to exploit. Google rates the Chromium security severity as Medium. The vulnerability affects Chrome on Windows, macOS, and Linux desktop platforms.

Critical Impact
Successful exploitation allows attackers to bypass CSP protections in Isolated Web Apps, undermining a foundational browser security boundary and enabling execution of restricted content within a crafted page context.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chrome desktop on Microsoft Windows, Apple macOS, and Linux
Isolated Web Apps subsystem within the Chromium browser engine

Discovery Timeline

2026-06-30 - CVE-2026-13886 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-13886

Vulnerability Analysis

The vulnerability resides in Chrome's Isolated Web Apps (IWA) implementation. IWAs are packaged web applications that run under a stricter security model than standard web pages, including hardened Content Security Policy defaults. In affected Chrome builds, the browser fails to fully enforce the CSP directives associated with an IWA when loading specific HTML content.

An attacker exploits the weakness by crafting an HTML page that induces the browser to load or execute resources that CSP should have blocked. Because the enforcement gap sits inside the browser rather than in a specific web application, the trust boundary being bypassed is one users and developers rely on for defense-in-depth. Exploitation requires user interaction, such as visiting an attacker-controlled URL or opening a malicious document.

Success primarily impacts integrity. There is no direct memory corruption, but bypassing CSP can enable script or resource injection that would otherwise be blocked, undermining containment for the affected IWA.

Root Cause

The root cause is insufficient policy enforcement inside the Isolated Web Apps code path [CWE-693]. Chrome's IWA loader does not consistently apply CSP checks against every content-loading branch, leaving a gap that a crafted HTML page can hit.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts or delivers a crafted HTML page. When a user loads the page within a vulnerable Chrome build that has Isolated Web Apps in scope, CSP directives fail to block prohibited content. Public proof-of-concept code has not been observed, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Refer to the Chromium Issue Tracker Entry for additional technical context.

Detection Methods for CVE-2026-13886

Indicators of Compromise

Chrome browser processes on endpoints reporting versions earlier than 150.0.7871.47 in inventory scans.
Web proxy or DNS logs showing user navigations to unfamiliar domains that serve HTML referencing Isolated Web App contexts.
Browser telemetry indicating CSP violation reports missing where they would normally be expected during controlled testing.

Detection Strategies

Inventory Chrome versions across managed endpoints and flag any host running a build earlier than 150.0.7871.47.
Correlate browser process telemetry with outbound web traffic to identify users visiting suspicious HTML resources following phishing lures.
Review CSP violation reporting endpoints for gaps or anomalies that suggest bypass activity in IWA-enabled deployments.

Monitoring Recommendations

Ingest browser and endpoint telemetry into a centralized data lake and alert on outdated Chrome installations.
Monitor for user interaction patterns involving newly registered domains hosting HTML pages targeting corporate users.
Track Google Chrome Stable channel release notes and align vulnerability management SLAs to browser advisories.

How to Mitigate CVE-2026-13886

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints.
Force a browser relaunch after update deployment to ensure the patched binary is active in user sessions.
Validate patch rollout through endpoint management tooling and remediate hosts that fail to update automatically.

Patch Information

Google released the fix in the Stable channel update documented in the Google Chrome Desktop Update advisory. Administrators should deploy Chrome 150.0.7871.47 or newer. Enterprise deployments using Chrome Browser Cloud Management or MSI/PKG/DEB packages should pull the updated installer from Google's enterprise download channels.

Workarounds

Restrict use of Isolated Web Apps through enterprise policy where the feature is not required for business workflows.
Enforce phishing-resistant web filtering to reduce user exposure to attacker-controlled HTML pages that could trigger the flaw.
Educate users to avoid opening untrusted links until the browser update is confirmed installed across the fleet.

bash

# Verify Chrome version on Linux endpoints
google-chrome --version

# Example: enforce minimum Chrome version via Group Policy on Windows
# Set HKLM\Software\Policies\Google\Chrome\TargetVersionPrefix to 150.0.7871.47